One problem I see with those kind of products is that quickly become obsolate.
I just have learned that my 2013 Panasonic plasma TV (all pre 2014 Panasonic flat screen smart TVs for that matter) will become obsolete, as Youtube is moving to HTML5 from Flash. No way to update the TV set. This feature will simply no longer work.
Same with new streaming services coming up - there is no way to integrate them in any pre 2014 audio gear. So if you bought ARC Ref for example - there is no way to expand it's set of features.